package org.lmw.weather.util;

import java.util.List;
import java.util.Stack;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.ResolveInfo;
import android.content.pm.PackageManager.NameNotFoundException;

/**
 * 应用程序Activity管理类：用于Activity管理和应用程序退出
 *
 */
public class AppManager {

	private static Stack<Activity> activityStack;
	private static AppManager instance;

	private AppManager() {
	}

	/**
	 * 单一实例
	 */
	public static AppManager getAppManager() {
		if (instance == null) {
			instance = new AppManager();
		}
		return instance;
	}

	/**
	 * 添加Activity到堆栈
	 */
	public void addActivity(Activity activity) {
		if (activityStack == null) {
			activityStack = new Stack<Activity>();
		}
		activityStack.add(activity);
	}

	/**
	 * 获取当前Activity（堆栈中最后一个压入的）
	 */
	public Activity currentActivity() {
		Activity activity = activityStack.lastElement();
		return activity;
	}

	/**
	 * 结束当前Activity（堆栈中最后一个压入的）
	 */
	public void finishActivity() {
		Activity activity = activityStack.lastElement();
		finishActivity(activity);
	}

	/**
	 * 结束指定的Activity
	 */
	public void finishActivity(Activity activity) {
		if (activity != null) {
			activityStack.remove(activity);
			activity.finish();
			activity = null;
		}
	}

	/**
	 * 结束指定类名的Activity
	 */
	public void finishActivity(Class<?> cls) {
		for (Activity activity : activityStack) {
			if (activity.getClass().equals(cls)) {
				finishActivity(activity);
			}
		}
	}

	/**
	 * 结束所有Activity
	 */
    public void finishAllActivity() {
	for (int i = 0, size = activityStack.size(); i < size; i++) {
	    if (null != activityStack.get(i)) {
		activityStack.get(i).finish();
	    }
	}
	activityStack.clear();
    }

	/**
	 * 退出应用程序
	 */
    public void AppExit(Context context) {
	try {
	    finishAllActivity();
	    ActivityManager activityMgr = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
	    activityMgr.restartPackage(context.getPackageName());
	    System.exit(0);
	} catch (Exception e) {
	}
    }
	
	
	/**
	 * 检测安装
	 */
    public static boolean checkApp(Context c, String packageName,int versionCode) {
	// 检测当前包名的应用是否安装,检测当前包名的当前版本的应用是否安装
	PackageInfo packageInfo = null;
	try {
	    packageInfo = c.getPackageManager().getPackageInfo(packageName, 0);
	    if (packageInfo.versionCode == versionCode) {
		return true;
	    }
	} catch (NameNotFoundException e) {
	    return false;
	}
	return false;
    }
	/**
	 * 解析包名下的MainActivity启动路径
	 */
	public static String getMainClass(Context c,String packageName){
	    if(!packageName.equals("")){
	    	String mainClassName="";
	    	
	    	Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
		resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		resolveIntent.setPackage(packageName);
		List<ResolveInfo> activitys = c.getPackageManager().queryIntentActivities(resolveIntent, 0);
		ResolveInfo ri = activitys.iterator().next();
		if (ri != null) {
		    mainClassName = ri.activityInfo.name;
		}
		return mainClassName;
	    }
	    return "";
	}
	
}